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diff --git a/.gitignore b/.gitignore
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--- /dev/null
+++ b/.gitignore
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+custom.mk
+*.tgz
+S??tailscale
+tailscale
+tailscaled
diff --git a/LICENSE.txt b/LICENSE.txt
new file mode 100644
index 0000000..98cc6e9
--- /dev/null
+++ b/LICENSE.txt
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+
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+   Copyright 2022 Naoaki Ueda
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diff --git a/Makefile b/Makefile
new file mode 100644
index 0000000..7fab907
--- /dev/null
+++ b/Makefile
@@ -0,0 +1,42 @@
+-include custom.mk
+
+.PHONY: help
+help:
+	@echo 'usage: make install ASUS_HOST=<your-nas-host>'
+	@echo '<your-nas-host> needs to be able to connect through rsync or ssh.'
+
+PREFIX_2_DIGIT ?= 55
+init_file = S$(PREFIX_2_DIGIT)tailscale
+
+.PHONY: install
+install: tailscaled tailscale install.sh | $(init_file)
+	$(if $(ASUS_HOST),,$(error ASUS_HOST variable is not defined))
+	@set -eu; \
+	remote_temp_dir=$$(ssh $(ASUS_HOST) -- mktemp -d); \
+	if [[ -z "$$remote_temp_dir" ]] ; then \
+		echo 'cannot create a temporary directory on `$(ASUS_HOST)`'; \
+		exit 1; \
+	fi; \
+	set -v; \
+	rsync -rltv $^ $(init_file) $(ASUS_HOST):$${remote_temp_dir}/; \
+	set +v; \
+	echo "warn: Don't forget exec \`$${remote_temp_dir}/install.sh $(init_file)\` on remote host to install"
+
+$(init_file): SXXtailscale.template
+	cp -a $< $@
+
+tailscale tailscaled: $$(tailscale.tgz)
+	tar --strip-components 1 -xmvzf $$< $(basename $$<)/$@
+
+$$(tailscale.tgz):
+	curl -L $(TGZ_URL) -O
+
+.PHONY: clean
+clean:
+	rm -f *.tgz $(init_file) tailscale tailscaled
+
+.SECONDEXPANSION:
+# default is latest
+VER ?= $(shell curl -s https://api.github.com/repos/tailscale/tailscale/releases/latest | perl -nle '/"name":\s*"(.+)"/ and print $$1')
+TGZ_URL = https://pkgs.tailscale.com/stable/tailscale_$(VER)_arm64.tgz
+tailscale.tgz = $(notdir $(TGZ_URL))
diff --git a/SXXtailscale.template b/SXXtailscale.template
new file mode 100755
index 0000000..68c5d6e
--- /dev/null
+++ b/SXXtailscale.template
@@ -0,0 +1,34 @@
+#!/bin/sh
+
+export PATH="/sbin:/usr/sbin:/bin:/usr/bin:/usr/builtin/sbin:/usr/builtin/bin:/usr/local/sbin:/usr/local/bin:/opt/sbin:/opt/bin"
+
+TAILSCALED="/usr/local/sbin/tailscaled"
+PIDFILE="/var/run/tailscaled.pid"
+
+# Extra flags you might want to pass to tailscaled.
+FLAGS="--tun=userspace-networking"
+
+mkdir -p /var/run/tailscale/ /usr/local/lib/tailscale
+mkdir -p /dev/net
+mknod /dev/net/tun c 10 200
+chmod 777 /dev/net/tun
+
+start-stop-daemon \
+    --start --background \
+    --exec $TAILSCALED \
+    --make-pidfile \
+    --pidfile "$PIDFILE" \
+    -- \
+    --statedir=/usr/local/lib/tailscale/ \
+    --state=/usr/local/lib/tailscale/tailscaled.state \
+    --socket=/var/run/tailscale/tailscaled.sock $FLAGS
+
+# sleep 5
+if ! grep -q 'net.ipv4.ip_forward' /etc/sysctl.conf ; then
+    echo 'net.ipv4.ip_forward = 1' >> /etc/sysctl.conf
+fi
+if ! grep -q 'net.ipv6.conf.all.forwarding' /etc/sysctl.conf ; then
+    echo 'net.ipv6.conf.all.forwarding = 1' >> /etc/sysctl.conf
+fi
+
+sysctl -p /etc/sysctl.conf
diff --git a/install.sh b/install.sh
new file mode 100755
index 0000000..ed1d309
--- /dev/null
+++ b/install.sh
@@ -0,0 +1,44 @@
+#!/bin/sh
+
+set -euvo pipefail
+
+PIDFILE="/var/run/tailscaled.pid"
+
+__error() {
+    echo "$@" >&2
+    exit 1
+}
+
+if [[ $# -lt 1 ]] ; then
+    __error "usage: $0 <init-file>"
+fi
+
+init_file="$1"
+
+base_dir=$(dirname $0)
+backup_dir="$base_dir/backup"
+
+if [[ -e "$PIDFILE" ]] ; then
+    sudo start-stop-daemon -K -p $PIDFILE || true
+fi
+
+__backup_if_exist() {
+    backup_dir=$1
+    shift
+    mkdir -p $backup_dir
+    for f in $@ ; do
+        if [[ -e $f ]] ; then
+            cp -r $f $backup_dir/
+        fi
+    done
+}
+__backup_if_exist $backup_dir /usr/local/bin/tailscale /usr/local/sbin/tailscaled /usr/local/etc/init.d/$init_file
+
+sudo cp $base_dir/tailscale  /usr/local/bin/tailscale
+sudo cp $base_dir/tailscaled /usr/local/sbin/tailscaled
+sudo cp $base_dir/$init_file /usr/local/etc/init.d/$init_file
+sudo chmod +x /usr/local/bin/tailscale
+sudo chmod +x /usr/local/sbin/tailscaled
+sudo chmod +x /usr/local/etc/init.d/$init_file
+
+sudo /usr/local/etc/init.d/$init_file